Chapter 8 Chemical Equations Solutions To Review Questions Page 7
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9- Chapter 8 -
28. CaCO
s
2 HC
H
O
aq
Ca C
H
O
aq
CO
g
H
O l
3
2
3
2
2
3
2 2
2
2
29.
Δ
+
+
+
+
Δ
CH
+ 2 O
CO
+ 2 H
O
C
4
2
2
2
O
H
30. (a)
C(s)
O
(g)
CO
(g)
2
2
(b)
CO
(g)
C(s)
2 CO(g)
2
D
(c)
Fe
O
(s)
3 CO(g)
2 Fe(l)
3 CO
(g)
2
3
2
D
Fe
O
(s)
4 CO(g)
3 Fe(l)
4 CO
(g)
3
4
2
31. 2 B
3 G
2 BG
2
3
32. The metals that should be chosen are (b) zinc, (c) aluminum, and (e) calcium. These metals are more
active than nickel, therefore will react in a solution of nickel(II) chloride; (a) copper and (d) lead are less
active and will not react with nickel(II) chloride solution (see Table 8.2).
Equations
Zn
NiCl
Ni
ZnCl
2
2
2 Al
3 NiCl
3 Ni
2 AlCl
2
3
Ca
NiCl
Ni
CaCl
2
2
33. Ti
Ni NO
Reaction occurs
3 2
Ti
Pb NO
Reaction occurs
3 2
Ti
Mg NO
no reaction
3 2
Ti is above Ni and Pb in the activity series since both react. Ti is below Mg in the series since it will not
replace Mg. From the printed activity series in the chapter Ni lies above Pb so the order is:
Mg
Ti
Ni
Pb
34. (a)
4 Cs
O
2 Cs
O
2
2
(b)
2 Al
3 S
Al
S
2
3
(c)
SO
H
O
H
SO
3
2
2
4
(d)
Na
O
H
O
2 NaOH
2
2
- 89 -
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